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                [Scoi2016]妖怪                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><div>邱老师是妖怪爱好者，他有n只妖怪，每只妖怪有攻击力atk和防御力dnf两种属性。邱老师立志成为妖怪大师，于</div>
<div>是他从真新镇出发，踏上未知的旅途，见识不同的风景。环境对妖怪的战斗力有很大影响，在某种环境中，妖怪可</div>
<div>以降低自己k&times;a点攻击力，提升k&times;b点防御力或者，提升自己k&times;a点攻击力，降低k&times;b点防御力，a，b属于正实数</div>
<div>，k为任意实数，但是atk和dnf必须始终非负。妖怪在环境(a,b)中的战斗力为妖怪在该种环境中能达到的最大攻击</div>
<div>力和最大防御力之和。strength(a,b)=max(atk(a,b))+max(dnf(a,b))环境由a，b两个参数定义，a，b的含义见前</div>
<div>文描述。比如当前环境a=3，b=2，那么攻击力为6，防御力为2的妖怪，能达到的最大攻击力为9，最大防御力为6。</div>
<div>所以该妖怪在a=3，b=2的环境下战斗力为15。因此，在不同的环境，战斗力最强的妖怪可能发生变化。作为一名优</div>
<div>秀的妖怪训练师，邱老师想发掘每一只妖怪的最大潜力，他想知道在最为不利的情况下，他的n只妖怪能够达到的</div>
<div>最强战斗力值，即存在一组正实数(a,b)使得n只妖怪在该环境下最强战斗力最低。</div>
<div></div></p><hr/><h3>输入格式</h3><p><div>第一行一个n，表示有n只妖怪。接下来n行，每行两个整数atk和dnf，表示妖怪的攻击力和防御力。</div>
<div>1&le;n&le;10^6, 0＜atk,dnf&le;10^8</div></p><hr/><h3>输出格式</h3><p><p>&nbsp;输出在最不利情况下最强妖怪的战斗力值，保留4位小数。</p></p><hr/><h3>样例输入</h3><pre>3 
1 1 
1 2 
2 2</pre><hr/><h3>样例输出</h3><pre>8.0000</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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